JP2006111568A - Sheetlike pack material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sheetlike pack material of impregnation type that has excellent sense of use, hardly causes causing fluid dripping during handling and has high economic efficiency. <P>SOLUTION: This sheetlike pack material is obtained by welding and bonding the bonding part of the laminate of two or more nonwoven fabrics composed of a cellulose-based fiber and a synthetic fiber by high-frequency or ultrasonic waves in a noncompressive state so as to be dispersed as a partial welding pattern. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a sheet-shaped pack material having a high impregnation ratio of liquid cosmetics such as pack cosmetics.
In addition, the present invention is excellent in flexibility and fit by joining a nonwoven fabric composed of a plurality of cellulosic fibers and synthetic fibers by partial welding in an uncompressed state, and excellent in impregnation retention of a large amount of liquid cosmetics. It relates to a sheet-like pack material. “Partial welding” means a state in which the joints are dispersed in a pattern over the entire sheet surface.

Conventionally, as a representative basic makeup for the purpose of moisturizing the skin, it has been widely used to pack a pack material on the skin surface, and recently, a pack having functions such as skin whitening and anti-aging. The demand for timber is increasing.
Conventional pack materials are either of a type in which the pack agent is applied alone or wiped off or washed away, or a so-called peel-off type in which the film formed after application of the pack agent itself is peeled off from the skin. The application | coating to was complicated. Later, gel sheet type pack materials in which a gel layer containing the pack agent was provided on the sheet base material and impregnated type pack materials in which the pack material was impregnated into the sheet base material were developed. ing.

  However, the gel sheet type product has the disadvantages that the manufacturing process is complicated and not economical, and that it is difficult to adjust the viscosity of the gel and to uniformly apply it to the base material during manufacturing. In addition, since the thickness of the gel sheet type product is thick, it becomes highly flexible when used, poor fit to the face, easy to get stuffy, used for a long time and over a wide range of skin surfaces, especially the entire face It was unsuitable as a large pack material used in Furthermore, it cannot be said that the penetration rate of the active ingredient from the gel layer into the skin is good, and it has drawbacks such as pain associated with peeling from the skin after use.

On the other hand, the impregnated type pack material is obtained by impregnating a relatively thin sheet base material such as a non-woven fabric with a liquid such as a cosmetic liquid, and is relatively easy to manufacture and economically advantageous compared to the gel sheet type. It is. Moreover, since thin sheets, such as a nonwoven fabric, are used, they are flexible and have a good feeling of use. Furthermore, since the penetration rate of the active ingredient into the skin is high and peeling from the skin after use is easy, it is currently widely used as a large pack material used for the entire face. However, the impregnated type pack material has a thin sheet base material such as a nonwoven fabric in order to enhance the feeling of use, so the amount of impregnated retention of cosmetic liquid etc. is not sufficient, and there is a limit to the supply of cosmetic liquid etc. to the skin. It was.
Furthermore, in order to improve the impregnation retention amount, there is a method using a relatively thick nonwoven fabric or a mesh-like nonwoven fabric, but the former method has a high bending resistance, so that the feeling of use is poor and dripping occurs during use. There was a thing.

In order to solve these problems, the present inventors have reported a face mask (Patent Document 1) that is excellent in fit and feeling during use by specifying the bending resistance of the sheet base material. However, it has not been sufficient in terms of liquid retention.
In addition, it is sufficient to weld and bond two or more nonwoven fabrics by embossing or the like to form a large number of recesses on the surface of the sheet base material such as nonwoven fabric by embossing to increase the impregnation retention amount. A technique (Patent Document 3) has been proposed for obtaining excellent liquid retention, but since the area of the compressed concave portion of the nonwoven fabric is hardened at the time of welding processing, the bending resistance of the sheet is increased and the sheet is used as a pack material. The softness and fit were impaired and the liquid retention was not good.

JP 2004-097785 A JP 2003-292421 A JP 2000-290899 A

  Therefore, an object of the present invention is to provide an impregnation type sheet-shaped pack material having sufficient impregnation holding power for liquid cosmetics and excellent in flexibility and fit.

The sheet-like pack material of the present invention has a basic structure in which a pack material is impregnated into a base material in which two or more nonwoven fabrics are partially heat-welded and joined.
That is, the present invention is characterized by the following configuration.
(1) A liquid cosmetic is impregnated in a sheet-like pack base material having a joint part formed by partially welding a laminate of two or more nonwoven fabrics composed of cellulosic fibers and synthetic fibers in an uncompressed state. An impregnated type sheet-like pack material.
(2) The sheet-shaped pack material as described in (1) above, wherein the joint is partially welded by high frequency or ultrasonic waves.
The term “joining” as used in the present invention is not based on bonding the entire contact surfaces of the overlapped nonwoven fabrics, but is 0.05 to ²⁰ mm ² by thermal welding between the overlapped nonwoven fabrics, preferably 0.1. It refers to bonding by thermal welding with a joint having an area of ˜10 mm ² , more preferably 0.5 to 5 mm ² .

Since the joining between the plurality of non-woven fabrics in the sheet-like pack material of the present invention is based on heat fusion bonding using ultrasonic waves or high frequencies, it can be joined in an uncompressed state. As a result, when using the sheet-like pack material, the soft feeling and fit feeling can be utilized without damaging the soft texture of the nonwoven fabric.
Moreover, since it is based on the hot melt adhesion of the nonwoven fabric using ultrasonic waves or high frequency, a sheet-shaped pack material having a good soft feeling and a good fit can be obtained without breaking the soft texture of the nonwoven fabric. Furthermore, since the obtained sheet-like pack material has an appropriate “stiffness” due to the laminated structure, it can be easily expanded from the folded state in the product, and has excellent liquid retention, so that dripping occurs during use. Since it does not get wet, the hair and clothes do not get wet and handling is improved.
In addition, by joining a plurality of non-compressed nonwoven fabrics used for the sheet base material, the hardened recesses in the compressed state are not formed as in the case of conventional embossing, so the impregnation amount is also higher than that of the embossed one. Can be increased. For example, the sheet-like pack material obtained in the present invention can hold an impregnating liquid of 10 times or more of the dry weight, so that it can be impregnated and retained with a sufficient amount of cosmetic liquid and the like even during use, and effective against the skin Ingredients can continue to be supplied over time.

In the present invention, a liquid cosmetic is applied to a sheet-like pack base material having a non-compressed joint by partially welding a laminate of two or more nonwoven fabrics made of cellulosic fibers and synthetic fibers by high frequency or ultrasonic waves. Characterized by impregnated sheet-type pack material.
The sheet-shaped pack material of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are plan views of the sheet-shaped pack material of the present invention, and FIG. 3 is a laminate of two or more nonwoven fabrics composed of cellulosic fibers and synthetic fibers. FIG. 4 is a sectional view of a welded portion of an embossed sheet-like pack base material in a conventional example.

As shown in FIG. 1, the sheet-like pack material 1 of the present invention has a joint portion 3 that is partially welded to various portions of a sheet-like base material 4 having a knob 2 and a notch 6. As shown in FIG. 3, the bonding portion 3 is melt bonded by high frequency or ultrasonic waves at each portion of the base sheet 4 such as a nonwoven fabric, but is firmly bonded in an uncompressed state. The joining part 3 may be either regular or irregular joining in plan view. In the case of regular bonding, line bonding may be performed as shown in FIG. 1 or point bonding may be performed as illustrated in FIG. 2, but when melt bonding is performed by high frequency or ultrasonic waves, FIG. As shown in FIG.
On the other hand, since the sheet-shaped pack base material 4 is joined by embossing, the cross-section of the conventional sheet-like pack material joined is compressed as shown in FIG. This part is hard because the nonwoven fabric is bonded in a compressed state, and even if it is impregnated with liquid cosmetics in this state, it is not stiff and soft, and the amount of liquid cosmetics impregnated is small .

  The best mode for carrying out the present invention will be specifically described below.

  In the present invention, two or more, preferably 2 to 3 non-woven fabrics are joined to produce a sheet-like pack material. When four or more non-woven fabrics are joined together, the water retention is improved, but it becomes too hard, resulting in poor flexibility and fit. The base material to which two or more nonwoven fabrics are joined preferably has a base softness of 5 mN · cm or less according to the JIS L1913 (1998) cantilever method. When the bending resistance exceeds 5 mN · cm, the sheet base material is too hard to have a good fit and the feeling of use is lowered.

The non-woven fabric used in the present invention comprises cellulose fibers such as cotton or rayon and synthetic fibers such as polyester fibers such as polyethylene terephthalate (PET), polyolefin fibers such as polyethylene (PE) and polypropylene (PP), or polyamide fibers. It is better to use something.
Cellulosic fibers are generally hydrophilic and have water absorption, so it is necessary to contain cosmetic liquids. Synthetic fibers such as PET, PE, and PP are thermally bonded due to their heat melting properties. Necessary for adding functionality.
This is because the cellulosic fiber alone is inferior in mechanical strength when wet, and therefore has the effect of reinforcing by adding synthetic fiber and improving deformation resistance.
The blending amount of the cellulosic fiber and the synthetic fiber needs to be blended in consideration of the balance of water retention and heating adhesive force, and the weight ratio of the cellulosic fiber and the synthetic fiber is cellulosic fiber / synthetic fiber = 10. / 90 to 90/10, preferably 20/80 to 80/20. If the hydrophilic cellulose fiber is less than 10 wt%, the water retention capacity is not sufficient, and if it exceeds 90 wt%, it does not heat and weld sufficiently, the bonding force between the sheet base materials becomes weak, and the sheet shape is maintained. It is because it becomes impossible.

The thickness of the non-woven fabric is 0.01 to 5.0 mm, preferably 0.05 to 3.0 mm, more preferably 0.1 to 2.0 mm in consideration of the balance between the feeling of use such as soft feeling and fitting feeling and the moisture retention.
The basis weight of the nonwoven fabric is 10 to 100 g / m ² , preferably 15 to 80 g / m ² , and more preferably 20 to 50 g / m ² . If it is less than 10 g / m ² , it is not practical because the liquid content is insufficient and shape retention becomes difficult, and if it exceeds 100 g / m ² , it becomes too hard and the flexibility and fit will deteriorate. is there. The density of the nonwoven fabric is 0.05 to 0.5 g / cm ³ , preferably 0.07 to 0.4 g / cm ³ , more preferably 0.1 to 0.3 g / cm ³ .
Moreover, as a manufacturing method of such a nonwoven fabric, things, such as an interlace, a spun bond, a spun lace, or a needle punch, are mentioned, for example, A spun lace product is especially preferable.

The planar shape of the joint may be linear or point-like, and may be any shape such as an appropriate shape such as a rectangle, a square, a round, an ellipse, or a rhombus depending on circumstances.
The joints are dispersed on the entire sheet surface at a density of 0.5 to 100 pieces / cm ² , preferably 1 to 50 pieces / cm ² , and more preferably 2 to 20 pieces / cm ² . The joint is a partial weld dispersed in a pattern over the entire sheet surface. This pattern may be any arrangement such as parallel, staggered, or rhombus lattice. The reason why the joint portions are dispersed without being concentrated at one place is to maintain the texture and shape of the nonwoven fabric in the sheet-like pack material. For example, when the joints are concentrated along the outline, the outline portion becomes too hard, and other portions are liable to be deformed due to kinking. The total area of the joint is preferably 0.05 to ²⁰ mm ² . If it is less than 0.05 mm ² , the base material tends to be destroyed due to insufficient adhesive strength, and if it exceeds 20 mm ² , it becomes impossible to maintain a soft texture and bulkiness.
Furthermore, the area ratio which occupies for the whole of all the junction parts is 1 to 40%. If it is less than 1%, the bonding cannot be maintained and the sheet base material tends to be destroyed, and if it exceeds 40%, not only the feeling of use is deteriorated but also the water retention is reduced.

  The joint is formed by means of thermal welding by internal heating using high frequency or ultrasonic waves. According to the means of internal heating by high frequency or ultrasonic wave, the temperature distribution of the cross section of the joint at the time of welding is uniform, so the fibers on the nonwoven fabric surface are not melted vigorously and are welded without pressing. Therefore, the fibers in the entire bonded portion do not become a film-like state, and a part of the fiber shape of the nonwoven fabric can be left. Welding in such a state is referred to as “uncompressed state” welding. If the welding is performed in a non-crimped state, a good feeling of use can be maintained without impairing flexibility, and the amount of impregnation and holding of the cosmetic liquid does not decrease. Moreover, since it is heated uniformly, a stronger adhesive force can be obtained than heat welding by embossing or the like.

On the other hand, since the means by external heating such as impulse seal, laser, infrared ray, hot jet, etc. is due to heat conduction, the temperature distribution of the cross section of the joint becomes the highest at the time of welding, and the fiber on the nonwoven fabric surface The texture of the nonwoven fabric is impaired by vigorous melting.
In particular, in embossing with pressurization, the fibers in the joint are in a film-like state to the inside, so that not only the flexibility is impaired, but also the impregnation retention amount is reduced.

Two base sheets made of spunlace nonwoven fabric (weight per unit area: 40g / m ² ) composed of 20% cotton as cellulosic fiber and 80% by weight PET fiber as synthetic fiber are superposed and ultrasonic fusion using an ultrasonic transmitter Bonding was performed by heat sealing using ultrasonic waves on a pattern roll by a dressing device to produce a two-layer base material sheet for a pack material. The row pattern of the heat seal joint is a parallel pattern intersecting at an angle of 120 degrees from the left and right (FIG. 1), and the individual shape of the joint is a rectangle. The density of the joints is 3 / cm ² , the area per piece is 2 mm ² , and the area ratio of all the joints is 6.5%.
The above base sheet was made wet by the method defined in JIS L1913 (1998 established), and the bending hardness when wet (sample size 2.5 cm x 25 cm) was measured by the cantilever method, it was 2.5 mN · cm. It was very soft.
Further, the obtained base material sheet was punched with a Thomson blade to produce a face mask having knobs on both the left and right sides. The face mask is folded into six folds, immersed in distilled water for 1 minute in a beaker, pulled up, and left for 1 minute in the air. Thus, such a numerical value of the water absorption rate is a high value that cannot be obtained with conventional pack materials.

<Practical evaluation test>
About the above-mentioned face mask impregnated with cosmetics, there are 5 levels (5 points: very good, 4 points: good, 3 points) about the wearing feeling when using 10 female subjects, especially the feeling of fit to the unevenness of the face. : Normal, 2 points: bad, 1 point: very bad).
The evaluation test result was an average value of 4.4 points. Further, since it has an appropriate “koshi”, it is easy to expand from a folded state at the time of use, and adhesion between sheets is strong, so that delamination does not occur during handling such as expansion.
Furthermore, since a sufficient amount of cosmetic can be impregnated and retained, the active ingredient can be continuously supplied to the skin for a long time without dripping when using the face mask.

Three base sheets made of spunlace nonwoven fabric (weight per unit area 20g / m ² ) composed of 50% by weight of cotton as cellulosic fiber and 50% by weight of PET fiber as synthetic fiber are superposed, and ultrasonic fusion using an ultrasonic transmitter is performed. A two-layer base material sheet for a pack material was manufactured by heat sealing using ultrasonic waves on a pattern roll by a dressing device.
The row pattern of the heat seal joints is such that parallel patterns intersect at an angle of 120 degrees from the left and right, and the individual shapes of the joints are rectangular.
The density of the joints is 3 / cm ² , the area per piece is 2 mm ² , and the area ratio of all the joints is 6.5%.
The substrate sheet was wetted by the method defined in JIS L1913 (1998 established), and the bending hardness when wet (sample size 2.5 cm x 25 cm) was measured by the cantilever method. It was 4.2 mN · cm It was very soft.

<Practical evaluation test>
The substrate sheet was punched with a Thomson blade to produce a neck care sheet. The neck care sheet was folded in four, immersed in distilled water for 1 minute in a beaker, pulled up, and left in the air for 1 minute. Met. This is an unprecedented high value.
Next, when the neck care sheet impregnated with cosmetics is actually used, it has an appropriate “koshi”, so it is easy to expand from the folded state during use, and the adhesion between the sheets is strong. Therefore, delamination did not occur during handling such as development.
Moreover, since it is a soft sheet | seat, a feeling of wearing was also favorable. Furthermore, since a sufficient amount of cosmetics can be impregnated and retained, the active ingredient can be continuously supplied to the skin for a long time without causing dripping during use.

Two base sheets made of spunlace nonwoven fabric (40 g / m ² per unit area) consisting of 60% by weight of cotton as cellulosic fiber and 40% by weight of PP fiber as synthetic fiber are superposed, and a high frequency dielectric heat seal is made using a high frequency sewing machine. By doing so, a two-layer base material sheet for pack material was produced. The row pattern of the heat seal joints is a lattice pattern (FIG. 2), and the individual shapes of the joints are round. Further, the density of the joints is 5 / cm ² , the area per piece is 0.8 mm ² , and the area ratio of all the joints is 4.3%.
The above base sheet was made wet by the method defined in JIS L1913 (1998 established), and the bending hardness (sample size 2.5 cm x 25 cm) when wet was measured by the cantilever method, it was 2.7 mN · cm. It was very soft.
The base sheet was punched with a Thomson blade to produce a face mask having knobs on both the left and right sides. The saturated water content of the face mask was measured by the method described in Example 1 and found to be 1293% by weight. This is an unprecedented high value.

<Practical evaluation test>
About the face mask impregnated with cosmetics, there are 5 stages (5 points: very good, 4 points: good, 3 points) for wearing feeling when used for 10 female subjects, in particular, the feeling of fit to the unevenness of the face. When a practical evaluation test of 2 points: bad, 1 point: very bad was conducted, the evaluation result was 4.1 points (average value). Further, since it has an appropriate “koshi”, it is easy to unfold from a folded state during use, and the adhesion between sheets is strong, so that delamination does not occur during handling such as unfolding. Furthermore, since a sufficient amount of cosmetic can be impregnated and retained, the active ingredient can be continuously supplied to the skin for a long time without dripping when using the face mask.

Three base sheets of spunlace nonwoven fabric (weight per unit area 30g / m ² ) composed of 70% by weight of rayon as cellulosic fiber and 30% by weight of PET fiber as synthetic fiber are superposed, and a high frequency dielectric heat seal is made using a high frequency sewing machine. By doing so, a two-layer base material sheet for pack material was produced. The row pattern of the heat seal joints is a lattice (FIG. 2), and the individual shapes of the joints are squares. The density of the joints is 5 pieces / cm ² , the area per piece is 1 mm ² , and the area ratio of all the joints is 5.4%.
The above base sheet was wetted by the method specified in JIS L1913 (1998 established), and the bending hardness (sample size 2.5 cm x 25 cm) when wet was measured by the cantilever method, it was 3.8 mN · cm It was very soft.

<Practical evaluation test>
The base material sheet was punched with a Thomson blade to produce a leg care sheet. The leg care sheet was folded in eight, immersed in distilled water for 1 minute in a beaker, pulled up, and left in the air for 1 minute. Met. This is an unprecedented high value.
Next, when actually using the leg care sheet impregnated with cosmetics, it has a moderate “koshi”, so it is easy to expand from the folded state during use, and the adhesion between the sheets is strong. Therefore, delamination did not occur during handling such as development.
Moreover, since it is a soft sheet | seat, a feeling of wearing was also favorable. Furthermore, since a sufficient amount of cosmetics can be impregnated and retained, the active ingredient can be continuously supplied to the skin for a long time without causing dripping during use.

[Comparative Example 1]
A base sheet for a sheet-like pack material was produced which was a spunlace nonwoven fabric (weight per unit area: 40 g / m ² ) composed of 70% by weight of cotton as cellulosic fibers and 30% by weight of PET fibers as synthetic fibers. The substrate sheet was made wet by the method defined in JIS L1913 (1998 established), and the bending hardness (sample size 2.5 cm × 25 cm) when wet was measured by the cantilever method. As a result, it was 1.4 mN · cm. It was.
The base sheet was punched with a Thomson blade to produce a face mask having knobs on both the left and right sides. When the saturated water content of the face mask was measured by the method described in Example 1, it was 693% by weight.

<Practical evaluation comparison test>
About the face mask impregnated with cosmetics, there are 5 stages (5 points: very good, 4 points: good, 3 points) for wearing feeling when used for 10 female subjects, in particular, the feeling of fit to the unevenness of the face. When a practical evaluation test of 2 points: bad, 1 point: very bad) was conducted, the evaluation result was 4.5 points (average value). However, since there was no “koshi”, it was difficult to expand from the folded state.
From the above results, the product of Comparative Example 1 is good in terms of flexibility and fit, but it is difficult to supply a sufficient amount of cosmetic liquid or the like to the skin due to insufficient impregnation. there were. In addition, there was a drawback that the handleability during use was poor.

[Comparative Example 2]
Two layers of spunlace nonwoven fabric (weight per unit area: 40g / m ² ) composed of 20% by weight of rayon as cellulosic fiber and 80% by weight of PET fiber as synthetic fiber are laminated and heat-bonded by an embossing machine, and two layers The base material sheet for sheet-like pack materials was manufactured. The recesses of the thermal bonding points formed by embossing are circular with a depth of 0.15 mm and an opening shape of 1 mm, and are distributed at a density of 8 pieces / cm ² .
The above substrate sheet was wetted by the method defined in JIS L1913 (1998 established), and the bending hardness (sample size 2.5 cm × 25 cm) when wet was measured by the cantilever method, it was 6.7 mN · cm. It was. Further, the base sheet was punched with a Thomson blade to produce a face mask having knobs on both the left and right sides. The saturated water content of the face mask measured by the method described in Example 1 was 328% by weight.

<Practical evaluation comparison test>
About the face mask impregnated with the above cosmetics, there are 5 levels (5 points: very good, 4 points: good, 3 points) about the wearing feeling when using 10 female subjects, especially the feeling of fit to the unevenness of the face. : Normal, 2 points: Bad, 1 point: Very bad) When the practical evaluation test was conducted, the evaluation result was 1.8 points (average value).
From the above results, the product of Comparative Example 2 has a sheet that is hard, so that the flexibility and fit are poor, and the impregnation property is not sufficient.

Plan view of sheet-like pack material of the present invention (line joining) Plan view of the sheet-like pack material of the present invention (point joining) Sectional view of the sheet-like pack material of the present invention Sectional view of a conventional sheet-shaped pack material

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet-like pack material 2 Picking part 3 Non-compression joining part 4 by ultrasonic or high frequency Sheet-like base material 5 Conventional compression joining part 6 Cutting

Claims (2)

Impregnation characterized in that a liquid cosmetic is impregnated into a sheet-like pack base material having a joint part in which a laminate of two or more nonwoven fabrics made of cellulosic fibers and synthetic fibers is partially welded in an uncompressed state Type of sheet-like pack material. The sheet-like pack material according to claim 1, wherein the joining portion is partially welded by high frequency or ultrasonic waves.